Finding the Fourth Proportional to 9,780.35, 14,650.67 and 7,809.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,780.35 : 14,650.67 = 7,809.31 : x
2. Step 2: Convert to fraction form
   9,780.35/14,650.67 = 7,809.31/x
3. Step 3: Cross multiply
   9,780.35x = 14,650.67 × 7,809.31
4. Step 4: Simplify right side
   9,780.35x = 114,411,661.57
5. Step 5: Solve for x
   x = 114,411,661.57/9,780.35
6. Step 6: Final answer
   x = 11,698.12